Road grader



May 2, 1933. 3` E DEAN 1,906,549

ROAD GRADER Filed Jan. 2, 1931 `3 Sheets-Sheet 1 May 2,y 1933.

ROAD GRADER f Filed Jamz, l'-p s sheets-sheet 2- QTYOWCCLSSL @IEDEAN 1,906,549`

G. E. DEAN ROAD GRADER May 2, 1933.

Filed Jan. 2, 1931 3 Sheets-Sheet 3 CIIIIID;`

.UU DCID n 'n D u D DDD Patented May 2; 1933 o nisuimble l'umgersi fiom an'ppersupport erence to the truck chassis fraieis-'th it@ 'fthe in`vetioln 'scfaperbmdeg `lifting immo inoperative Por.

ated either inde mib@ 11, rear wheels 12, a cab 13 and side members 10, these side members forming the chassis of thetruck frame. The side members serve as the supporting members from which 5 the scraping apparatus ,is depended, in praces essere wenn u su r y e ve y )u in. briciii. y

As clearly shown in Figs. 1, 2.and 5, shoes 1 18 are adjustabl mounted upon the spaced parallel bars 16 y means of studs threaded thereinto and extending upwardly between the bars 16 and throu h plates 19 positioned along thetops of the Ears. The shoes 18 are 13 undercut as shown and overla the rim of the turntable 20 or adjustable circle member lvlvhereby the turntable may be rotated within mits` v A beam 21 is firmly attached to the `turn- *0 table 20 as by means of bolts 22 and hence these two members operate as one. A locking element or segment 23, see Fig. 5, is formed with a series of notches 24 these semicircular openings bein ada to receive the locking do 25, this locking dog being rigid u n the ever 26 pivoted at 27. The pvot is supported on the cross member this cross memberbein adjustably mounted upon the spaced pa el bars 16 as 3 indicated at 29. l

The free end of the lever 26 is engaged by the link or rod 30 which extends forwardly to connect with the manually o rated lever.v

31, this last mentioned lever 31 `ng locked 35 in position by means of any suitable mechanism such as indicated at 32. See Fig. 1.

The cross member 21 has depending hangers 35 in which rock shafts 36 and 37 are rotatably mounted. These rock shafts are 4 of identical construction. Also, elements between the rock shafts and the scraper blade,

as well as the hydraulic operating units therefor, are of substantially like construction one being ri h -hand and the other being lefthand, an ,hence, only one of these units will be described. Heavy springs 38 are connected at one end as by means of the plate and bolts 39, to the rock shaft and the lower ends of these sprin are fastened to the plate 40.

5 The plate 40 as an opening 41 therein and a suitable scra blade 42 is adjacent thereto. A bolt 43 passes through the plate 42 and a tapered washer member 44 is tightly held against the tapered face of the plate 53 by means of the nut 45. See Fig. 4. By

proper manipulation of the locking means ust recited the blade may be tightly clamped o the late 40 and pressure exe upwardly as own by the arrow, against the blade 0 simply wedge the tapered washer member 44 against the tapered blade and hence prevent any upward movement whatsoever.

Clamps have an ear 51 extending therefrom and are t` tly clamped about a rock shaft37. A 52spivoted totheear 51 the cross head and the connectin and a depending arm 53 is rigid with and extends from the crank shaft 54. See Figs. 1 and 3. The crank shaft 54 is mounted in L-shaped bearing brackets 55, these brackets or base plates resting upon and being supported by the cross beam 21. The base plate or bracket 55 serves to sup rt the cylinder 56, havin a piston 57 therein. A piston rod 58 exten s from the piston and a cross head 59 serves to connect the rods 60 to arms 61 which are rigid with the crank shaft 54.

From the construction just set forth it will be apparent that movement of the piston 57 will cause the scraping blade 42 to move to and from its operative osition. For instance, referring to Fi and 2, movement of thepiston 57 towa s the right will cause rod 60 to turn the crank shaft 54 in a cloc wise direction. This movement of the crank shaft will be transmitted through the depending arm 53 to the link 52 which will, in turn, rotate the rock shaft 87 in a counter-clockwise direction so as to force the blade 42 downwardly against the surface on which it is o rated.

e cylinders .56 have pipes or conducting means and 66 leadin from their front and rear ends, respective y. These pipes or conductin means serve to transmit fluid pressure w ereby the piston 57 may be forced along the cylinders 5 as desired.

Mounted inthe cab of the truck, see Figs. 1 and 2, is a tank or receptacle or reservoir 67 having al suitable pump therein (not shown) and driven by a motor 68. An outlet ptie 69, having a check valve 70, transmits e fluid from the pump to one of the four gorts of the four-way valve 71. See Fig. 7.

he opposing port of the four-wa valve has a conducting means or i 72 w ich returns to the reservoir or tan om which the inlet to the pump leads. A suitable handle 73 is adapted to be manually operated whe y the lug 74 may be properly positioned. ne of t e two remainin ports of the four-way valve 71 has a ipe 5 leading downwardly, this pipe branc ing into branches 76 and these'branch connections leading throu h the valves 78 and 79 respectively. The va ve 78 connects with a rearwardly extending pipe 80 which terminates in one of the lateral y extending pipes 65, and the valve 79 connects with a rearwardly extending pipe 81 which termiisates in the other laterally extending pl l e remaining port of the four-way valve leads to a downwardly extending pipe 82 which connects with a rearwardly extending pipe 83, this pipe being branched at the T 84. From this T 84 the previously referred to connections 66 extend into the front part of the cylinders 56.` The pipes or connecting tubes 80, 81k and 83, which lead rearwardly to the operating cylinders 56, are 130.

flexible as they are located between the hydraulic control device and the cross beam, these latter two elements having movement relative to each other.

The voperation through the pressure pipe 69 into the four-A Way valve 71 and then rearwardly through the pipes 75, 76, 77, 80 and 81 and finally through the lateral pipes into the rear of the cylinders 56 thus forcing the pistons 57 forwardly and pushing-the blade 42 against the road. It will also be noted that the fluid passes through the valves 78 and 79 during the movement justdescribed.

It may be desirable to rotate the entire cross beam assembly from about its vertical pivot in order to properly position the scraper blades with respect to the road. That 1s, the cross beam .2.1 may be in either of the dotted line positions as shown in Fig. 2, or at any intermediate position. And, furthermore, it is often times desirable to quickly change the cross beam from one'position to another. Previous to my invention it has been the practice to use separate and distinct means for accomplishing the above manipulation but due to my novel arrangement of parts I am able to expediently accomplish this result 'by movement of the truck itself along the road. This is possible due to the fact that I have two separate scraping blades together with novel hydraulic operating means therefor.

Referring back to the valves 78 and 79, it will be apparent that one of these might be entirely closed, thus shutting off the fluid from the corresponding cylinder and thus preventing the corresponding blade from contacting with the road surface. However, the other blade, upon actuation of the pressure motor 68, will be forced downwardly against. the road and movementV of the truck,

either forward or backward as desired, will cause the entire turntable and its depending parts to be rotated about its vertical pivot point. The lever 31 is operated to release the pivoted lever 26, carrying the locking dog 25, during the above manipulation and when such is completed the turntable may be again locked in its desired position by return of the handle 31 to its original position whereby the locking dog 25 engages one of the notches in the segment on the turntable.

When it is desired to elevate the blades from the road the handle 73, of the four-way valve 71, is rotated so as to connect the pressure pipe 69 with the pipe 82, this causing the return pipe 72 to be connected with the pipe 75. Now, when the Apump is operated the pressure fluidwill travel rearwardly through ing the "pistons 57tothe rear and raising the scraper bladesfrom the-road;' If desired, one

of the-valves 78 or 79 might be ykept closed during thisv manipulation Withthe consequence'that one lof thescraper blades remains in its original'position asjthe fluid .on the other* side of" the piston couldynotv escape therefrom. Y

F or instance, if thevalve 78 were'closed the kfluid cannot escape throughv the out-let pipe 65v andthe corresponding scraper blade f' would stay inffits original position.

Having' thus revealed this invention, I

claim asnew anddesire to secure thefollowing-combinations and elements or equivalents thereof,l by -Letters Patent ofV the United States: y f' I claimz" j' '31; `In combination, a frame fhaving two sets of spaced parallel members at either side thereof, two shoes located adjacent each of said sets of parallel members, bolt means extending from said shoes upwardly between said parallel members whereby the said shoes may be slid along the said parallel members, means for clamping each of the several shoes in its desired position, a turntable revolubly supported by said shoes and a beam rigidly attached to sai-d turntable. t

2. In a combination of elements as set forth in claim 1 the addition of means for locking the turntable against rotation for the pur-L pose described.y

3. In a device as recited in claim 1, the y combination of 'a cross member attached to said sets of parallel members, a lever pivoted onto said cross member, means for os'- cillating said lever, a locking dog located on said lever at a point spaced from its pivot point and adjacent said turntable, said turntable having a locking element thereon, said locking element being recessed at a plurality of points to receive the locking dog whereby the turntable is held against rotative movement.

4. A road gradercomprising a movable frame having parallel members thereon, va turntable located beneath and adjacent to the said parallel members, shoes fastened to the .said parallel members and extending under the said turntable to revolubly support the same, a beam attached to the turntable and scraping means fastened to the beam.

5. A road scraper as set forth in claim 4 but in which the several shoes are adjustably mounted whereby the turntable and its beam may be bodily adjusted along the said parallel members for the purpose described.

6. A construction` of the class described comprising a frame adapted to be moved in a forward direction over the ground, a cross member mounted thereon, hangers depending from the underside of the said cross members, a rock shaft revolubly mounted in said hangers, a scraper blade fastened to the rock shaft and extending downwardly and 5 rearwardly to contact against the surface of the ground, an ear rigidly attached to the rock shaft and extending upwardly and rearwardly therefrom, a shaft, means to revolu bly mount the last mentioned shaft rearwardl0 ly with respect to and s aced from the said ear, an arm, rigidly attac ed to the said shaft,

- extending downwardly therefrom, a link pivoted to said arm at one end and to the said ear at its other end, a second arm rigidly at- 15 tached to the said shaft andextending upwardly therefrom, a prime mover mounted upon the said cross member and means connected to the said second arm and operatively connected to the prime mover, said last 20 mentioned means being positioned substantially horizontally for the purpose described. In testimony whereof I affix my signature.

GEORGE E, DEAN. 

